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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f67da3798f5f43d099c8c599b7d8ee77fbe9588edec6018dd3322929bcda6816' 
  AND token = 'As+7Yoto0mZM2qO+p4U40C/ElJIOyTGRh4feK+QYX3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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