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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66dec2a58fd64ef40c305116e178871be7176edefaac66c7db255d2716bc0c19' 
  AND token = 'z6KUSLxtkM66VV8toGq8SNL2EbrUJvNZEIMN9jBfAF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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