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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86a0946f1d2054886c3a33e6bfe863e0aa6bd3722ea32470fed183db57efd6e2' 
  AND token = 'U7M0i5bKQntlDCGxIbnPpqdEreVyO2K6NfoxQWs0WbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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