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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b68e787ab90968d7eaf4f56a217c2b0fc12c720033927296fc5bd99ec50e88e' 
  AND token = 'Cp9IVpSXQCovEUkH1/vTztiTpTpT//I363CQ+UhHsLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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