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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2a8c754324ef58b9af49525e9ddc904fb61a68db8f41d9a8794c72f357f3648' 
  AND token = '0EOtClg4DLYGCrMOCY/154vkNztPyOrEA824fDvmdoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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