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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efd43e36cbe7e5a2f5a5575b05e5ff899e96cb11e4a9451d352e9a8360b9b1d2' 
  AND token = 'L2iZRXHhV7eB6/EHo9KAiLr4YqsV7unEe8ykWNg0t1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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