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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9b55f9754990f26b1d7896f46a90da0c2c315750d1c86e3e2d34e6c2d631a81' 
  AND token = 'tAXEzbdWElGBtM9Jy7a0nSHFMbGnwui3IuNJnnfMHto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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