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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b7c10694d3aa9f99b5c9b0c4b147636f4fefdaec529df536a67685ff06b7e0f' 
  AND token = 'bBVAIV/p8IEJN34k4C3yPD65ljGr1tko/I2/SndzIcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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