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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c614273d1e91764841e506932198b612708a5ef534acc6d46e25aad1145d612' 
  AND token = 'O0KUcPqKNxjMgum155oByTlYVrOcXs1nlimNoEUtgrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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