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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ad16a26b680d082aa4f833a99e73bf411b711b7b0b5a3c7fd7ce223b05922ac' 
  AND token = '2exWHWmJOjl1ARQCsK5QV5uayftldr2nXOBWCgtGweA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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