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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '495e64622a64b52d3148a26ffd9a28cc405dd8c283c54d959e6ec5fb596fd8af' 
  AND token = '4oha3uOckDqPzwdf88EPPatay4N3Vci74+Pwihk0Nww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}