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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37e6ff8f11e842091e3f7acd8e17eee67a655a182c3d566114a6e2ad7a89bb95' 
  AND token = '3gUrj4rQJFif+TEeowd8Z0b7lMGeUXNbaPYwZe4fkGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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