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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2cc40e9e668230170aecd289d7b95bd3237201c5958588fa0e2f80d84776f3c' 
  AND token = 'buQspi5KnC9YmEYa34eS+jDTF1PB/DaNAZdYh9+8yxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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