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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cda5822e2ce58355cd4afd70e51b7efbf27e5561be565cae16c015373c923f12' 
  AND token = 'rijbkO+96OxowJphGAIgg8Ad6uHifZfgu0+Q/r+Nlr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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