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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '842dfb3e164d8b25e03360c1a2beab062f1bf95ac0f41ce68a07439f059e9fbf' 
  AND token = 'eypSR/4m477qb8kNC78hZnL2zAIUCiJXM1RCGTcwp/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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