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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c2fba7c7971e1c5495378964ee6359da82b8da4aca008d6b18a5b11c6798cd7' 
  AND token = 'ipAQN6Uso7ajWCJNPK5/c10H2Dhm53TSi/xffmVM+dQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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