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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c60d2fb846770f02c3b7361dc2c6aff99fd94a4ad4a20aca3a4e5cf8eb67a3ea' 
  AND token = '7zNWOliFyk3oNG+GMSAPE8xKdedP5n3QgoNi8nGJ/Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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