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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41ecbbe5c405595d71836f1bedbfe0d639b696c500104a41b4fce0baac0ed78f' 
  AND token = 'Yns8cL//i2FTzbVylKKxRhjspdSn8wrT418JBkzgbCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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