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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7c3da35408e30ca5420d7b44ddc0514c51561aa2f4fd016f16d5c0902c37743' 
  AND token = '7yVVmjhCx955jh0Nj8ZFQes2ZfQ81R/GcgcJEGj0Rgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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