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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '674c945b47a8ed6f5936c251b445c1ae8ef753a6b874709b2ad496828033155a' 
  AND token = 'rV+7uO5rJTcfnwPDP6mQ8Jdz4q3iwUMFaV3ZpPihdEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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