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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a15a5c4308016ebafd037273c554479569b0fff16bfb38ecb3a3969e835d429' 
  AND token = 'VT93ht5TM4Fa7c4GjAnKtB1wy+S3oyu+vkpYSAUXO5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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