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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdade9e0306d5b63e10dae97ad51aa612ddc3d8a296f3500fa9abbdb534c5b83' 
  AND token = 'Lspu8+6G9fzEJTJxpmF60F/0+uKrRsJqrF1zE2p7W0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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