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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57093d277f1a3b8c6d337611d7fe1eff58451a868a2398882de41ef06d65ffe7' 
  AND token = 'InNQoRW/Nkh+axxmIV3VOc42boUTMnHpX/o/BkW7cRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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