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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3432d7843f284f57b0f53bbc96ee45af1c4a01da0a719e547abd3928af4ecdf0' 
  AND token = 'bVn0Xs4GwyMwig93k9CPPc6OLj2mKNHqnfZdCyBU+tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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