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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a76e01323c2e51f7ba9a7c1b2b20d3f450c9ea2a68b7d128f73386dc28c1ec0' 
  AND token = '7HebQid/SoojmabsaYqTOv0YAOrZ58LVT1KBg+LAcaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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