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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '131fd4ed5ce1ef2a322a4f079da003c82c9eb4ebe71f9f7e1c1cec7cdbe9ce0d' 
  AND token = 'w2wOEiLjN5AxVHlP0K8oVyCospa6qftK1iS+SS0M92A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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