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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cf254de3a9eff7cd2f3fdd25e1b1e3cc25404cc98baf94f05c85253dda66fef' 
  AND token = '/1GXswEag33GY/OF2WzJq0COCjKlDGCNADats329ooc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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