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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd0da9903125b51db9a7e50f4ec51d237cefb88388ea8a4708df7b7e59003fd1' 
  AND token = 'nNtqaatOKKIYMuTo2zl+p6KwjnQOeSeRv+rmqewSGY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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