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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1d3ca893ac7558beb3e77b5027e81d5c534cbef908a73fb284a05530e94f4a8' 
  AND token = '2nkgOovjs/pIUBMZTOppnWttFA8xM7GkBig5Q15R1FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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