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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10b29744c6d153bc9b4f2ed0e49e3fa5cf05f211846572a7abf774545d65ad0e' 
  AND token = 'DmvRkgnH1bDbloj5CDp/y+yUOKdwD9UFYu1mQmzuyFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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