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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '863955e2a34751c6287d59cc4e185e1b47b7017294e5f4e6d89c60952ca306d9' 
  AND token = '8P4IfOVyumIK/4NLf0sOW+CnGEX4fhve98ErY52qMAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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