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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d7d0cd939d6f3b46657b351c2e091c452a7bd5d1096e0b998f1fe23d5d7ce0a' 
  AND token = 'qG5awMF/DC/Xq45ow5PR2N5oaDwUfXqzfpwudgz+lGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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