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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e920eb512b8aee3913a820130b58e933248e96bf88278748bdfd8bb437520234' 
  AND token = 'ymqhqp+5X/JbJHMJoQ4D9K4t8lgIB+/m89uWc5o0xFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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