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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0eed146dd8e6cba2f785ade5edb57acd56431de4a63fc5cad74d18f29b7e5c0' 
  AND token = 'pXH0/ceBypoNoNLXP1dZDMWxOaseijo5lvnXNnGxuRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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