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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '636f810c267bbe1cd7e3473765fdc0b4cf13da6c04029a3b0a18da41535ab024' 
  AND token = 'MtB832W6Jkypwng+WUKIHjR2aAP13WV5PWeIQSIZ0cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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