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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e078549570213bc423c7debcd3e648d7dacd9ee0adead8aa24e79f9545750495' 
  AND token = 'pK47bzC0vt4R/jMn5hskJelNXww37w+c7vq0IKaQ4uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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