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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '002a4177c044e2aaaba2ee197da36af3a8b3e420d96b03a0f472c10316ef4dcf' 
  AND token = 'm4dh/+S42jI4aoorXWpTBdGlIH+x4BP5Lor6qp2N1UM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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