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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b14ff887443fd603f3c35cdfb4e63e9158fea6f32ad6eae2c719759962ad0bd7' 
  AND token = 'f89uBTTI7T8PoCvI+GgfC+a0nkfGfe9iagDYRc1Vmfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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