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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e55f9fa0af506cce6722c32daee1562c8797b559822a63ad076428f6f1d85c81' 
  AND token = 'DHZUow0fuW+KkCDt3r7/FnGwk7L5kIIsbyACbQbEpfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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