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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a083c9eda57b9892a1eb3a2a4452f81d7f871e05a48eb5beeb66b84e7d760084' 
  AND token = 'UR4BD36xoy9wC6f4/zOF3vbUySNOQOjXbOqNJOIUHXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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