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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2357bed6579752b222116204c2a5c395d0e75a9e51e48c123abec9d35ca7a02c' 
  AND token = 'HUT5KFIuQ3FD928hLnY6Ww0z5E1kwB3ESfdmVEi2K+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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