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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe8ceba69770e82ed5a05f169bf15451328d76d7a0cb7c8fc9d8f4fad44d46c2' 
  AND token = 'XCOCBfxbkDX0sKnGO2mDt9YAAihowE1VrchiAhNY8Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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