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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9140dfaa3643ba74f4c2aadd36587ca38c3cacbf980af2bdd39af7209f8c2a10' 
  AND token = 'BE7CNPPJtzOlS8O7A5Kv7fGfTuvChWGRryQlMAZxYto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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