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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc823a5bcc74ff097ef41e8bce180cee3e445cb4d3e462bcb2ddca077109f90b' 
  AND token = 'umcCrapBxnirh7l+Msiq0OIle9gxbADYQSvar7cLe8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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