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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a879665c8a47fb6d66840a7075c2371007896434aee78b657bd453834d70b5a7' 
  AND token = 'afg28P6HoTU/gbuzMOTpaWmlCN0Y1ArcRP4LX6aMFT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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