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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '517fcee1c24170cc647e2554c0802b66bfcacd2e0557af44c046868a86787832' 
  AND token = 'qGP4aTgVBaUu0LJ/k/ar9XFDEl55XaC2sv23bSOaaA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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