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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb975ee6352e8af50b6faf0778efa44c8907ac6ccc330a951cb74ec0cb345258' 
  AND token = 'vztF5iT6Byrt96ZDjkcsk4jD70vnx1h6Iq6G+tpH214=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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