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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7fd0cab7b69de07f877235a4ae653ab122370f3dcae7d0f8479c0f8dc8a74d0' 
  AND token = 'ZzJIbnP6Jv/dPSqGvfWq9/WLl4n9xRs1ST0jAWPZzac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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