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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbbacf7f3151ed035d6b1a2af0a01f307e7f843f766d028974c094ee5d20c99c' 
  AND token = 'kKs13LhyKLLRufI+4a73yxN36hvwQQ1zylW0hvFTbC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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