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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74fb0c887cf164f19af1e5749475c564fd327b047b2becde86a20b86d69f0add' 
  AND token = '+EQIfbu7+b5J3CjfqIzOEth83uMa1iiC68Ys9XaznOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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