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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c0d45856f42eade887e8c19b9128fccf56b1219676d5a5152a6da24e12ff95' 
  AND token = '0HYPBCEQi2DFxx/e8jBg/B+oDerPDE+kcYItmaNTLMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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