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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96acc4169fbadfee6f94fa83bcd16d978e7631aa7ba45c8300be0033bedd06b6' 
  AND token = 'vY0i8Mqb2N/4pDWjmK41YK5C/dwRSgB0iDDAxC/W+p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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