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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eb206a3058dadf7cb94645643c601a1e73a83a9796489f669ec0098e7d67055' 
  AND token = 'oGHIFB/IjQzRcXUjpykJ7g0O/dGx1Nd7reRVINP+ibI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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