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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd1ec266a1a62e3a9a4cd16e03fd4c1c39233f85be646cb884f79084b338bfba' 
  AND token = 'tcgPDkUXfZB+wdR5N5r7QV59+6pQq4rX4Lr52CuKSMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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