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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e0f8d7ac651b3c06a84f71d3b7c9c63aba3d71d26540252b65a14bbbfbf90b' 
  AND token = 'iPY+u0ZRZ6EO20iK+iJ8vLZ/i2WaGG1fWOfK8mvlV/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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