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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c3584f37c292659b7891879d6323d6923db9d8e1f33845067fd53250a4dd099' 
  AND token = 'y9H/USbIowxPEy4ZeNq3mC/Y3HzJp8Wn1V6SL5FUBrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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