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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6969d0f75049b0aab10eea813b16cf33ca8b5c9ace15e77dc5dfffe392f7a41' 
  AND token = '8RMRCZchX265F7ilgn4RHEigfOfwX7Dw9PFUBdBndjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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