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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aab989e632e82af2dad1a1056f6ae8fbd60c95be88369526301a35178b443f6' 
  AND token = '64ZfJdu6PEzK6wFcL9pVMwA/gsbkTbCI/c0eKOVkbfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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