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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6baa4c1b79ff1331c0201658da73d5437fa0d1c5bd24cd5124f0adcfe4ce42b9' 
  AND token = 't8wk9azXp7AfN/H5zyFh0ee7BIR1+MNmaA5J+ruAtLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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